Air at 15°C flows at 9 m/s parallel to a thin flat platemeasuring 260 mm × 390 mm. The direction of flow is parallel to the260-mm edges. The surface of the plate is at a uniform temperatureof 85°C. The plate is in a large chamber with walls at atemperature of 22°C. The emissivity of the plate’s surfaces is0·75. (a) Determine the rate of convective heat transfer from oneside of the plate to air. [16] (b) Determine the rate of radiantheat transfer from one side of the plate the chamber walls. [4] (c)In the configuration described above, consider two values offreestream air speed: 9 m/s and 100 m/s. Sketch a graph showing thevariation of local heat flux q'' (x) as a function of distance xalong the plate from the leading edge for each value of speed,showing the two curves on a single set of axes. It is not necessaryto calculate values for q'' (x) but you should determine thecorrect shape of each curve. Briefly explain the reasons fordifferences between the curves.
